EP 0933534 A3 2001-01-10 - Axial flow fan

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US 1760498 A 19980203

US 9505998 A 19980610

Abstract (en)

[origin: EP0933534A2] A high efficiency axial flow fan includes a hub, fan blades and a circular band. The hub rotates about a rotational axis when torque is applied from a shaft rotatably driven by a power source. The circular band is concentric with the hub, connected to the tip of each blade, and is spaced radially outward from the hub. The blades are configured to produce an airflow when rotated about the rotational axis. Each blade has a chord length distribution, stagger angle and dihedral (axial) distance which varies along the length of the blade. The dihedral distance of each blade varies as a function of blade radius from the rotational axis.